Are there any mainstream movies from Thailand that shows nudity like The Wolf of Wallstreet or Basic Instinct?

Unlikely. Thailand censors movies and tv shows extensively. The censorship includes guns to the head, cigarettes in the mouth, or nudity.

Thai censors do have some trouble with American slang, but also censors rough language. The old way was to just cut the scenes, but lately they are using a version of "pan and scan" technology to artificially move the view away from the offending view, sometimes creating a "great shot" of an empty chair or a wall. The offending words are just made silent for that portion of the movie/tv.

Yes, it is a strange world.

yes, they're called porn movies and they sell them on dvd along with the other movies.

Probably not. Nudity is not allowed on TV. Pornography is illegal there.

when you have real avenues why bother with dvd/cd